fix: crash when using online mode with uninitialized jieba (#2663)

Gang Zhuo

2025-09-20 6244b743a70f8ac152e6b8f517669671322da0a8

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X    1
XX    2
XXX    3
XL    4
L    5
LX    6
LXX    7
LXXX    8
XC    9